The Illinois Read requirements for any real estate used primarily for buying and selling of goods and services or manufacturing (Class 5) include: 1. A valid Real Estate License from the State of Illinois. 2. An approved zoning ordinance from the local municipality or county. 3. A Certificate of Occupancy (C of O) from the local municipality or county. 4. A Building Permit from the local municipality or county. 5. A Fire Prevention Permit from the local municipality or county. 6. A Certificate of Compliance for the building from the local municipality or county. 7. A Certificate of Inspection (COI) from the local municipality or county. 8. A Certificate of Compliance for the building from the local municipality or county's fire prevention bureau. 9. A Letter of Approval from the local municipality or county's fire prevention bureau. 10. A Certificate of Compliance for the building from the local municipality or county's building inspection bureau.